Marvel has released the first full trailer for Avengers: Doomsday, confirming it will arrive in theaters on December 18, 2026 The Verge Marvel.com.

Robert Downey Jr., who played Iron Man for over a decade in the Marvel movies, appears in the trailer as a new character: Doctor Doom, the main villain of the film. Chris Evans also appears, back as Steve Rogers. The trailer includes Thor (Chris Hemsworth), X-Men characters, the Fantastic Four, and the New Avengers The Verge. Pedro Pascal is in the trailer too, as confirmed by Marvel's YouTube channel Marvel Entertainment (YouTube).

Joe and Anthony Russo are directing the film, according to Marvel's official film page Marvel.com. Filming started on March 26, 2025 Marvel.com. Marvel revealed the cast several days later in a livestream that ran nearly six hours across its channels Marvel.com.

Avengers: Doomsday will open on the same day as Dune: Part 3, December 18, 2026 The Verge. It is unusual for two major films from large studios to share an opening weekend. The overlap will test whether enough people go to the movies during the holiday season to support both at the same time.

Marvel is expected to share more details about Avengers: Doomsday at San Diego Comic-Con later in the same week the trailer was released The Verge. An earlier teaser for the film came out in January 2026 Marvel.com.

Reuters reported in April 2026 that Marvel had shown a first trailer to theater audiences on April 16 of that year Reuters. The trailer released on July 20 is the first time the wider public gets to see footage that had only been shown in theaters before.

The trailer confirms several casting choices that people had been guessing about since the March 2025 livestream. Downey Jr. moving from Iron Man to Doctor Doom means the actor who was once the face of the hero side of Marvel is now playing the villain. Evans returning as Steve Rogers brings back another character from the earlier Marvel movies. The appearance of X-Men characters, the Fantastic Four, and the New Avengers in the same trailer shows that Doomsday will combine several different Marvel groups that have been brought together since Disney purchased Fox.

For fans following Marvel's current phase of movies, the trailer is where many separate storylines come together. Characters introduced in recent Disney+ shows and standalone films all appear to be heading into one large crossover story, directed by the Russo brothers, who also directed Infinity War and Endgame.

In my view, the detail that matters most here is the shared release date with Dune: Part 3. Both films appeal to overlapping but not identical audiences, and December 18 is close enough to the holidays that both could benefit from people going to the movies over several weeks rather than just on opening weekend. Whether either studio moves its release date, or both stay put, should become clear in the coming months.